quword
趣词
Word Origins Dictionary
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
back down (v.)
[back down 词源字典]
in figurative sense of "withdraw a charge," 1859, American English, from notion of descending a ladder, etc.; from
back
(v.) +
down
(adv.).
[back down etymology, back down origin, 英语词源]
[back down 词源字典]